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  1. Published by permission of the Director, Department of Terrestrial Magnetism.
  2. See, for example, “An Apparatus for Automatically Recording the Electrical Conductivity of the Air” by W. F. G. Swann, in “Annual Report of the Director of the Department of Terrestrial Magnetism” for the year 1917, Yearbook of the Carnegie Institution of Washington, 1917, p. 279. As indicated in the paper referred to, a preliminary form of the apparatus here described was used by Swann in 1917.

Swann, W. F. G.

See, for example, “An Apparatus for Automatically Recording the Electrical Conductivity of the Air” by W. F. G. Swann, in “Annual Report of the Director of the Department of Terrestrial Magnetism” for the year 1917, Yearbook of the Carnegie Institution of Washington, 1917, p. 279. As indicated in the paper referred to, a preliminary form of the apparatus here described was used by Swann in 1917.

Other (2)

Published by permission of the Director, Department of Terrestrial Magnetism.

See, for example, “An Apparatus for Automatically Recording the Electrical Conductivity of the Air” by W. F. G. Swann, in “Annual Report of the Director of the Department of Terrestrial Magnetism” for the year 1917, Yearbook of the Carnegie Institution of Washington, 1917, p. 279. As indicated in the paper referred to, a preliminary form of the apparatus here described was used by Swann in 1917.

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Figures (4)

Fig. 1
Fig. 1

General View of Constant-rate Slide-wire and Control Equipment

Fig. 2
Fig. 2

Schematic Diagram of Slide-Wire Connections

Fig. 3
Fig. 3

Plan and Elevations, Constant-Rate-Slide-Wire

Fig. 4
Fig. 4

View of Slide-Wire from Above